product gaping on 3 conveyors

Hi,

been given the task of gaping dough pieces over 3 conveyors to reduce/correct the error in position

I will know the rate a which the dough pieces 'should' be coming at me (7000 per hour) so around 0.5 seconds between dough pieces

I plan to use power-flex 525 drives over Ethernet in studio 5000

my thoughts would be to have a photocell timing falling edge to falling edge of product and then working out a % to increase or decrease speed of the next conveyor.

not 100% on how i would do it to achieve an accurate result. the 3 conveyors are spanning a gap of 1 meter so need to work out whether these need to be equal in length or not.

and ideas that would a better solution or any sample code for something similar would be great.

Thanks

Ben